IEC 61000-3-3 pdf download – Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤16 A per phase and not subject to conditional connection

IEC 61000-3-3 pdf download – Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤16 A per phase and not subject to conditional connection
1scope
This part of lEC 61000 is concerned with the limitation of voltage fluctuations and flickerimpressed on the public low-voltage system.
lt specifies limits of voltage changes which may be produced by an equipment tested underspecified conditions and gives guidance on methods of assessment.
This part of lEC 61000 is applicable to electrical and electronic equipment having an inputcurrent equal to or less than 16 A per phase,intended to be connected to public low-voltagedistribution systems of between 220 V and 250 V line to neutral at 50 Hz, and not subject toconditional connection.
Equipment which does not comply with the limits of this part of lEC 61000 when tested withthe reference impedance Zref of 6.4,and which therefore cannot be declared compliant withthis part, may be retested or evaluated to show conformity with lEC 61000-3-11.Part 3-11 isapplicable to equipment with rated input current s75 A per phase and subject to conditionalconnection.
The tests according to this part are type tests.Particular test conditions are given in annex Aand the test circuit is shown in Figure 1.
NOTE The limits in this part of lEC 61000 are based mainly on the subjective severity of flicker imposed on thelight from 230 vI60 w coiled-coil filament lamps by fluctuations of the supply voltage.For systems with nominalvoltage less than 220 V line to neutral and/or frequency of 60 Hz, the limits and reference circuit values are underconsideration.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies.For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 60050(161):1990,International Electrotechnical Vocabulary (IEV) – Chapter 161:Electromagnetic compatibility
IEC/TR 60725,Consideration of reference impedances and public supply impedances for usein determining disturbance characteristics of electrical equipment having a rated current≤75 A per phase
IEC 60974-1,Arc welding equipment – Part 1: Welding power sources
IEC 61000-3-2:2005，Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits forharmonic current emissions (equipment input current s16 A per phase)
IEC 61000-3-11，Electromagnetic compatibility (EMC) – Part 3-11: Limits – Limitation ofvoltage changes，voltage fluctuations and flicker in public low-voltage supply systems -Equipment with rated current s75 A and subject to conditional connection
IEC 61000-4-15，Electromagnetic compatibility(EMC) – Part 4: Testing and measurementtechniques – Section 15: Flickermeter – Functional and design specifications
3Definitions
For the purpose of this part of IEC 61000-3, the following definitions apply.
3.1
r.m.s. voltage shape. u)
the time function of r.m.s. voltage, evaluated as a single value for each successive half periodbetween zero-crossings of the source voltage (see Figure 2)
3.2
voltage change characteristic,au(t
the time function of the r.m.s. voltage change evaluated as a single value for each successivehalf period between zero-crossings of the source voltage between time intervals in which thevoltage is in a steady-state condition for at least 1 s (see Figure 2)
NOTE Since this characteristic is only used for assessments using calculations, the voltage in the steady-statecondition is assumed to be constant within the mea5urement accuracy (see 6.2).
3.3
maximum voltage change characteristic,AUmax
the difference between maximum and minimum r.m.s. values of a voltage changecharacteristic (see Figure 2)
3.4
steady-state voltage change,Au。
the difference between two_adjacent steady-state voltages separated by at least one voltagechange characteristic (see Figure 2)
NOTE Definitions 3.2 to 3.4 relate to absolute phase-to-neutral voltages， The ratios of these magnitudes to thephase-to-neutral value of the nominal voltage (U,) of the reference network in Figure 1 are called:
-relative voltage change characteristic: d(t)
( cefinition 3-2);
-maximum relative voltage change:dmax
(definition 3.3);
-relative steady-state voltage change: d.
(definition 3.4).
These definitions are explained by the example in Figure 3.
3.5
voltage fluctuation
series of changes of r.m.s. voltage evaluated as a single value for each successive half-period befween zero-crossings of the source voltage
3.6
flicker
impression of unsteadiness of visual sensation induced by a light stimulus whose luminanceor ‘spectral distribution fluctuates with time. [IEV 161-08-13]
3.7
short-term flicker indicator. Pst
the flicker severity evaluated over a short period (in minutes);Pst = 1 is the conventionalthreshold of irritability